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Apparatus and method for amplifying a signal

  • US 5,886,575 A
  • Filed: 09/30/1997
  • Issued: 03/23/1999
  • Est. Priority Date: 09/30/1997
  • Status: Expired due to Term
First Claim
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1. An amplifier circuit comprising:

  • an amplifier having an input and an output;

    a first Doherty amplifier having an input coupled to said output of said amplifier, an output and a control input;

    a detector having a detector input coupled to detect a first Doherty output signal of said output of said first Doherty amplifier, and an output;

    a controller having an input coupled to said output of said detector, and a first output and a second output;

    a switching regulator having an input coupled to said first output of said controller, and an output coupled to said control input of said first Doherty amplifier; and

    a variable attenuator having a signal input, an output coupled to said input of said amplifier, and a control input coupled to said second output of said controller.

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